To the original Idea I think this skills suggestion while a good one still isn't the best. Don't ask me what is because I honestly don't know what THE best way to have it is I just know theres a better one.

To having 6 types rather 3 I'm all for. I mentioned this in one of my posts not long ago. The game is to defined to three set characters and makes the game a lot less fun. This feature will defiantly have to come out before they come out with pvp. If it doesnt come out before pvp then the pvp will be extremely stupid. Everyone will have exactly the same stats with the same skills and the same armour. BORING.
Unless by some miracle Space Studios comes out with some completely new and intense gameplay. I really hope the game mechanics are redone or else this game is gonna tank hard.
In summary CHANGE THE GAME MECHANICS.